/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.msq.counters;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import nl.jqno.equalsverifier.EqualsVerifier;
import org.junit.Assert;
import org.junit.Test;

public class CpuCountersTest
{
  @Test
  public void test_forName_runDoer()
  {
    final CpuCounters counters = new CpuCounters();
    final CpuCounter counter = counters.forName("xyz");
    counter.run(() -> { /* Nothing in particular */ });
    final CpuCounters.Snapshot snapshot = counters.snapshot();
    Assert.assertEquals(ImmutableSet.of("xyz"), snapshot.getCountersMap().keySet());
  }

  @Test
  public void test_forName_runReturner()
  {
    final CpuCounters counters = new CpuCounters();
    final CpuCounter counter = counters.forName("xyz");
    Assert.assertEquals("boo", counter.run(() -> "boo"));
    final CpuCounters.Snapshot snapshot = counters.snapshot();
    Assert.assertEquals(ImmutableSet.of("xyz"), snapshot.getCountersMap().keySet());
  }

  @Test
  public void test_forName_accumulate()
  {
    final CpuCounters counters = new CpuCounters();
    final CpuCounter counter = counters.forName("xyz");
    counter.accumulate(1L, 1L);
    final CpuCounters.Snapshot snapshot = counters.snapshot();
    Assert.assertEquals(
        ImmutableMap.of("xyz", new CpuCounter.Snapshot(1L, 1L)),
        snapshot.getCountersMap()
    );
  }

  @Test
  public void test_counter_snapshot_equals()
  {
    EqualsVerifier.forClass(CpuCounter.Snapshot.class)
                  .usingGetClass()
                  .verify();
  }

  @Test
  public void test_counters_snapshot_equals()
  {
    EqualsVerifier.forClass(CpuCounters.Snapshot.class)
                  .usingGetClass()
                  .verify();
  }

  @Test
  public void test_nil_equals()
  {
    EqualsVerifier.forClass(NilQueryCounterSnapshot.class)
                  .usingGetClass()
                  .verify();
  }
}
